(1) Transfer of a pathologic product (e.g., a calculus) from one place to another where it causes less inconvenience or injury, when it is not possible or expedient to remove it from the body. (2) In chemistry, a double decomposition, wherein a compound, A-B, reacts with another compound, C-D, to yield A-C + B-D, or A-D + B-C. [meta- + G. thesis, a placing]
